Nut-lock.



F. A. FEHRENZ.

NUT LOCK. APPLICATION FILED JAN.5,19|5.

Patented June 29, 1915.

' America,

of Onondaga,

. a simple means in its inner face it is FREDERICK A. EEHEENZ, OE'SYMGUSE, NEW 'YOEK.

HUT-LOCK.

ins gnia.

Specification of Letters Patent.

r tested June as, rain.

Application filed danuaryfi, 1915. tterlal No. 682.

To'all whom it may concern Be itknown that I, FREDERICK A. FnHRENz, a citizen of the United States of and a resident of Syracuse, county State of "New York, have invented certain new and useful "improvements in -Nut-Ilocks, of which the following is a full and clear specification, reference'being had. to the accompanying drawings, in

. which- Figure 1 is a side elevation of a nut and bolt provided with my invention; Fig. 2 is av transverse section on the line 2 2m? Fig. 1; Fig.3 is a view partly in side elevation and partly in longitudinal section; Fig. 4 is a longitudinal section on line a r-e of Fig. 2 showing a slight modification; Fig. 5 is a detail perspective view of the grip ring or washer; Fig. 6 is a detail perspective of the locknut illustrated in Fig. d; and Fig. 7 is a detail side elevation showing a slight modification.

The object of this invention is to provide bolt, to thereby hold it against the work and prevent it loosening by turning backward, and this invention consists of certain novel features of construction hereinafter described and claimed.

In the drawings a designates a belt of the usual construction and b a work-holding nut of the usual construction, except that on its outer face, around the bolt hole, it is provided with a beveled groove or counter-sink.

The letter 0 designates a loclr' nut which is threaded on the bolt in the usual manner and is similar to the work nut except that provided with two radial grooves 0, one of which is a trifle the larger for a purpose hereinafter set forth, said grooves extending from the bolt hole to the edge of the nut.

The letter d designates a grip-ring or washer, which is split at one point in its circumference and is fiat on its outer face to fit s uarely against the inner face of the lock and eveled on its inner face to fit the beveled counter-sink'of the worl; nut, this beveling of the inner face of the grip-ring giving to the grip-ring a conical shape. This ring or washer-is ada ted to loosely slide over the threadsof the olt and on its outer face it isprovided with two outwardly-projecting lugs (JV-shaped to fit in the groove or g'roovesgin the inner face of the lock nut.

To bring the locking device into action,

that changes in details more,

for locking the nut on theelastic grip-ring will cause the grip-ring to be contracted and thus jammed hard against the threads of the bolt. In this manner the work nut is held against backward turning until the lock nut is loosened.

It will be observed that.,n1y device is exceedingly simple in construction and slicetive in operation. It will be observed also without departing from the spirit of my invention except as limited by the claims; for instance, any suitable number of lugs and recesses may beemployed, and, furtherthe arrangement of the lugs and recesses may be reversed, the lugs being carried by the lock nut and the recesses formed in the grip-ring, as shown in Fig. 7. It will be seen also, as shown in Figs. 4, 5 and 6, that the inner face of the lock nut may he slightly concave and the outer face of the grip-ring be correspondingly convex, so that i the tendency to grip the ring on the thread will be somewhat increased-when the lock nut is tightened up. It will be seen also that one of the grooves c in the lock nut is slightly larger than the other, this being apparent from Fig. 2; the object of this is to provide a suflicient lost motion between the grooves and their interlocking lugs d to permit the washer or grip-ring to expand and contract.

it will also b observed that the device affords a practic 1 locking nut where a fine adjustment is nesessary, as it may be securely locked in any desired position on a threaded member without being forced against the work. It will be further noted that this device is not confined solely to use on bolts, but may be successfully used Whenever a nut is used in connection with a threaded member.

' ing its inner face"bev eled to fit within said counter-sink and itsouter face provided may be resorted to with one or more lugs, said grip-ring or of the belt, a lock nut threaded on the bolt 15 Washer being adapted to slide looselj over adapted to abut the outer face of the gripthe threads of the bolt, and a lock nut ring,- and one or more interlocking lugs or threaded on the bolt provided with one or recesseson the grip-ring and lock nut for i more recesses adapted to receive the lugs on causing the grip-ring to rotate with the lock the grip-ring, whereby the grip-ring and the nut in jamming the grip-ring into the 20 lock nut are compelled to rotate together in threads of the bolt and in loosening it from jamming the grip-ring into the threads and the threads.

.in releasing it from the threads. In testimony whereof I hereunto afiix my 2. In combination with a bolt and nut, the signature in the presence of two Witnesses. latter having a beveled counter-"sink in its FRED. A. FEHRENZ. outer face, a split grip-ring having its'inner Witnesses: face beveled to fit within said counter-sink MARY C. FRIEDEL,

and adapted to slide loosely ever the threads VERA E. BERTRAND. 

